Gas-burner.



G. KEHH.

GAS BURNER.

APPLICATION FILED SEPT. 19. 1916.

Patented Jun. 9, 1917.

. should be provision burners of the type provided enonen KEITH, orLONDON, ENGLAND, AssIe on or ONE-HALF r0 JAMES KEITH, or

LoNnoN, ENGLAND.

GAS-BURNER.

Specification of Letters Patent.

Patented Jan. a, ram.

To all whom it may concern:

Be it known that I, GEORGE KEITH, a subject of the King of the UnitedKingdom of Great Britain and Ireland, and residing at London, England,have invented a certain new and useful Improvement in Gas-B urners, ofwhich the following is a specification.

This invention relates to improvements in gas burners, and moreparticularly to with an outlet extending longitudinally of the burnertube.

In practice it is found that a burne of the type referred to tends toburn more lgas at the end adjacent to the injector than at the endremote therefrom, there bemg a gradual diminution consumed along thelength of the burner proceeding from the end adjacent to the injector,whereas generally with similar long burners used for heating withdifferent forms ofv outlet the tendency is for the consumption toincrease toward the end remote from the injector.

Particularly in connection with the adaptation of such burners tobiscuit ovens and the like where the burners are disposed transverselyof the chain on which the biscuit pans move, it is desirable that therefor controlling the delivery of the combustible mixture at differentpoints along the length of the burner;

indeed, this would be the case even were the burners designed to deliverthe combustible ,mixture uniformly, as cooling influences' may affectdifferent parts of the oven differently and, on account of changes inconditions, it is important that an attendant on the spot should be ableto effect the necessary adjustment. Practically adequate I results maybe obtained by increasing temporarily the heating effect of one end ofthe burner at the first by way of the apertures in the par-' tition,

of the volume of gas .p

the expense of the other, as'may be effected by the preferredarrangements preferably the and a valve device fitted to the tubeadjacent to the inlet end and adjustable to 'control the distribution ofthe inflowing mixture so as to confine the mixture to enter the secondcompartment or in part to by-pass such compartment.

In the accompanying drawings, Figure 1s a longitudinal section showingone conon the lines AA and BB respectively (Fig. 1), Fig. 2 showing theby-pass valve, which in the instance illustrated is longitudinallyadjustable, and Fig. 3 showing the partition as of D-form in section.Fig. 4 is a part elevation part longitudinal section showlng a burner ofmodified construction rovided' with a circularly adjustable valve andfitted with a partition of modified form.

Figs, 5 and 6 are transverse sections on the lines CC and D-Drespectively (Fig.

4) illustrating the construction modified as above stated.

On reference to the drawings it Will be seen that the burner tubel isdivided longitudinally into tWo chambers 23 by the tubular or splittubular diaphragm or partition 4 the upper wall of which bears againstthe transverse screws 5, the interior of the tubular diaphragmconstituting the chamber 3.

In order to reduce leakage from one chamber to the other the diaphragmmay be of D-shape, as shown in Fig. 1, or substantially D-shape, asshown in Fig. 4, including a plane wall and a wall curved in substantialconformity with the curvature of the tube.

From the end of the-tubular diaphragm adjacent to the injector (notshown) a connection is taken to the latter, so that normally the wholeof the mixture passes into the chamber 3.

The diaphragm & is apertured atintervals at 6, the apertures beingpreferably formed for example as shown in Fig. 1 as narrow longitudinalslots the distribution of experimentally determined; slots aredistributed so that normally the delivery of the mixture through thesame is greatest at the end of which may be the burner remote from theinjector.

To provide for adjustment of the dis tribution, there is employed avalve device for by-passing the chamber 3 and admitting struction ofburner embodying the inventhe bulk of the mixture into the chamber 2,that is into the upper half of the burner tube, the arrangement beingsuch that when the by-pass is full open the maximum delivery is at theend of to the injector.

According to the adjustment of the valve device distributionintermediate the two extremes is obtainable. For example, as shown inFigs. 1 and 2 the valve device employed may comprise a short D-shapedtube 7 which fits snugly into the end of the tubular diaphragm 4:,adjacent to the injector, and the plane portion of which is adapted tocover an aperture 8 of suitable area in the plane portion of thediaphragm, thus forming a slidingfidamper. To provide for convenientdisplacement of the damper, there may be fixed to the plane portion ofthe latter a stud 9 one end of which projects through the by-passaperture 8 and the other end of which projects into the interior of thetubular diaphragm 4:, such stud being engageable by a rod pushed throughthe throat of the injector and capable of being conveniently manipulatedby the attendant. By reason of its formation, the damper is sufficientlyresilient to lock itself in any position into which it is shifted.

In the, construction of burner shown in Figs.4 to 6, the diaphragm 4 isof deformed circular'shape and is formed with lateral apertures 6 theobject of the lateral disposition of -the apertures being to. avoidlocal enlargement of the flame. The apertures 6 may be suitably spacedor grouped as may bedetermined by experiment so as to effect the desireddistribution;

At the end adjacent to the injector the inner wall of the diaphragm 4constitutes a.

surface of revolution, being in the instance shown of cylindrical form,and serves to sleeve a tubular valve 10 circularly adjustable to bring aport or ports therein into'or out of communication with a port orportsin the wall of'the diaphragm.

It will be seen that the arrangement is such that the'volume of mixtureby-passing the chamber 3 enters the chamber 2 at the lower side of theburner tube, tendency to local increase of the flame issuing at theoutlet being thus reduced.

What I claim is 1. A gas burner comprising, in combination, a tubehaving an outlet in the form of a the burner adjacent continuous slotextending longitudinally thereof and means for controlling the de liveryat different points along the length of the tube while maintaining aconstant efiecsame in part to by-pass such chamber in its' passage tosaid first named chamber.

3. A gas burner comprising, in combination, a tube having an outlet inthe form of a continuous slot extending longitudinally thereof, anapertured tubular partition fittedin said tube and means adjustable todirect the whole or a part only of the inflowing mixture into the.interior of said tubular partition.

4. A gas burner comprising, in combination, a tube having an outlet inthe form of a continuous slot extending longitudinally .thereof, anapertured tubular partition of substantially D-shape fitted in saidtube, screws disposed transversely of said tube and bearing on the planeface of said D-shaped' partition, and means for directing inflowingmixture wholly or in part into the interior -of said tubular partition.

5. A gas burner comprising a tube divided municating through alongitudinal series of apertures, one of said chambers having an outletin, the form of a longitudinal slot, and the other of said chambershaving a gas inlet at one end thereof, and means adjacent to'said inletand adjustable to direct all of longitudinally into two chambersintercom-- the gas entering said inlet into said lastnamed chamber or todivert a portion thereof into'said first-named chamber.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses. Y

I I GEORGE KEITH.

Witnesses:

HENRY MAsoN, ISABEL RoLno.

